1 Answer
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I didn't understand what's your problem exactly whether you've installed the os or you are trying to boot from CD but if it a HW related issue,

Try if the following could help:

To boot from a device selecting it, press F5 or F8 or F10 and at the system startup and select the device hitting enter to boot from

(or)

For Hard disk issue:

Generally the problem could be with the jumper settings on the HD which should be set to master(settings are printed on the HD with an image that how to set master & slave). Else,

Go to BIOS pressing DEL or F2(keys depends on Mother board) and check for the disk configuration(If you HD is listed then power connections are fine). And check for disk priorities and set it CD/DVD as 1st boot device, HD as Second(generally selecting the device and pressing + or - sets the priority). Finally save & exit. Else,

At last go to BIOS and check for something like Load Optimal Defaults(Don't select custom defaults and these you could find under EXIT option). Save & Exit.

I'm using an older PC

The older pc won't support more spaced HD and for this a separate pin is alloted to the newer HDs called Capacity Limitation Jumper(CLJ) and in those case you'll have to use this jumper settings